Horseshoe



(No Model.)

F. T. ROBINSON;

HORSESHOE.

No.'250.,97,7. Patented Dec. 13,1881.

INVBNTOR WITNESSES:

Jzyww/w BY JMWM f6 ATTORNEYS.

UNITED STATES PATENT OFFICE.

FRANCIS T. ROBINSON, OF LAURAVILLE, MARYLAND.

HO RSESHOE.

SPECIFICATION forming part of Letters Patent No. 250,977, dated December13, 1881.

Application filed September 2, 1881.

.To all whom it may concern Be it known that I, FRANCIS T. ROBINSON, ofLauraville, in the county of Baltimore and State of Maryland, haveinvented a new and useful Improvement in Horseshoes, of which thefollowingis a full, clear, and exact specification.

The object of my invention is to provide removable calks for horseshocswhich can readily be applied as required.

Theinvention consists in calks having wedgeform recesses, combined withshoes formed with permanent in gs of wedge form, that sustain the calks,as hereinafter described and claimed.

In the accompanying drawings, Figure l is a persprctive view of ahorseshoe fitted with the removable calks. Fig. 2 is a sectional sideview of the same. Figs. 3 and 4 are perspective views of the calksdetached.

Similar letters of reference indicate corresponding parts.

The shoe A is formed at its toe and heels with lugs a, of wedge form.

The calks B are formed with wedge-form recesses b, that fit snugly onthe lugs a, and a cross-pin, a, passing through the calks B and logs a,retains the calks in place.

The calks B may be smooth or sharp. Fig.

(No model.)

3 shows a smooth calk, and Fig. 4a sharp one. Either form is to be usedaccording to the condition of roads, as will be understood, and it isevident that a change can be made in a molnent.

This form of calks has strength where it is required, and there are noweak portions liable to become broken. Use tends to tighten the calks onthe shoes, and there beingno wear on the lugs a, only the calks need tobe renewed from time'to time.

The calks can be formed of steel or chilled iron, and will then lastmuch longer.

I am aware that it is not new to secure a calk to a shoe by a pin orwedge in conjunction with a tongue and groove, or bya flange and tenonon calk and corresponding mortises in the shoe, or by making the calk intwo parts and clamping them on a T-lug of shoe; but

What I do claim as new is The combination, with the wedge a on shoe, ofa calk, B, having a corresponding recess to receive it, whereby the calkwill not work loose, but become tighter as it is worn, as described.

FRANCIS THOMAS ROBINSON.

Witnesses:

J ULIUs W. KNOX, FRANCIS S. ERDMAN.

